Sagger containing calcium hexaluminate composite layer and preparation method of sagger
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A calcium hexaaluminate and composite layer technology, which is applied in the field of composite layer saggers, can solve the problems of cracks in the composite layer, complex production process, high cost of zirconia, etc. low cost effect
Active Publication Date: 2021-08-24
湖南荣晟昌新材料科技有限公司
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Although several substances have strong corrosion resistance, the cost of zirconia is relatively high, and the mentioned substances are all thermal expansion substances. The composite layer is prone to cracks, adhesion decreases, and the protective layer falls off during repeated recycling.
And the composite layer is often applied by dipping, spraying, or secondary pressing, and the process is complicated
[0005] "A sagger with a high-temperature corrosion-resistant coating for lithium batteries and its preparation method" (CN201610159837.X) patent technology, the sagger body is made from mullite and cordierite, etc. The surface impregnation glaze improves the anti-erosion performance, but increases the impregnation step and increases the complexity of the production process
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preparation example Construction
[0032] The present invention also provides a preparation method of a sagger with a calcium hexaaluminate composite layer, comprising the following steps:
[0033] Step 1. In terms of mass fraction, weigh 10-30% of calcium hexaaluminate, 40-60% of magnesium-aluminum spinel, 15-30% of alumina, 5-20% of mullite, and 5-20% of kaolin , and the binder, placed in a mixer and stirred until uniformly mixed, and aged to obtain calcium hexaaluminate composite layer powder;
[0034] Step 2. When the sagger is broken and pressed, first use a brush to clean the lower mold surface of the mold;
[0035] Among them, the mold requirements: the opening of the sagger product is facing downward when the mold is opened, and the lower mold surface 2 of the mold is installed on the lower template of the press;
[0036] Tooling design requirements: composite layer powder is applied to the inner opening of the tooling 3, set on the lower die surface 2 of the mold, and the material stopper 4 is bent so...
Embodiment 1
[0042] A sagger containing a calcium hexaaluminate composite layer, including composite layer powder, the components of the composite layer powder are calculated by mass percentage: calcium hexaaluminate 5-18% by weight, magnesium aluminum tip Crystal 25%-50%wt%, alumina 10-20%wt%, mullite 10-35%wt%, kaolin 5-10%wt%, polyvinyl alcohol solution 5-8%wt% (concentration is 3~5wt%),
[0043]
[0044]
[0045]Step 1, according to calcium hexaaluminate 15%wt%, magnesium aluminum spinel 40%wt%, alumina 15%wt%, mullite 20%wt%, kaolin 5%wt%, polyvinyl alcohol solution 5% wt% (concentration is 3 to 5wt%) for mixing, and the mixture is placed in a mixer to stir until the mixture is uniform, and after aging for 24 hours, calcium hexaaluminate composite layer powder is obtained;
[0046] Step 2. When the sagger green embryo is pressed, first use a brush to clean the lower mold surface of the mold, and then use the composite powder to apply tooling 3. Fill the powder made in step 1 wi...
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Abstract
The invention discloses a sagger containing a calcium hexaluminate composite layer and a preparation method of the sagger. The sagger containing the calcium hexaluminate composite layer is a composite layer sagger and comprises a base layer and the calcium hexaluminate composite layer, and when the sagger is prepared, a simple tool for applying composite layer powder is adopted, the powder is uniformly applied to the inner surface of the sagger, the calcium hexaluminate composite layer powder and the matrix layer powder are molded into a blank in one step in a mold pressing mode, and then the blank is fired and molded in a high-temperature kiln. The sagger has the beneficial effects that calcium hexaluminate, magnesium aluminate spinel, aluminum oxide and mullite in the calcium hexaluminate composite layer provided by the invention are matched, so that the composite layer has the advantages of high temperature resistance and corrosion resistance, meanwhile, the calcium hexaluminate composite layer is equivalent to the matrix layer in thermal performance and is well matched with the matrix layer, the composite layer is not easy to separate and fall off, and the service life of the sagger is prolonged. The method has the advantages of low production cost, simple process, energy conservation and environmental protection.
Description
technical field [0001] The invention relates to the technical field of composite layer saggers, in particular to a sagger containing a calcium hexaaluminate composite layer and a preparation method thereof. Background technique [0002] Lithium-ion batteries are currently widely used in mobile communications, energy storage, electric vehicles and other fields. At present, the main commercial positive electrode materials include lithium cobaltate, lithium manganate, lithium iron phosphate and ternary materials, which are prepared by high-temperature solid-phase method, and various precursors are placed in a sagger and sintered at 900-1300°C (push plate kiln or roller kiln). The sagger materials used for firing are generally cordierite, mullite, quartz and corundum. When the sagger is in service, it is cooled rapidly after high temperature. With the increase of the number of uses, the thermal shock resistance of the sagger is reduced, and the sagger is prone to cracks, which...
Claims
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